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Pierce gas cap - what do I have?

Mark Wetherbee

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I had been looking for a correct gas cap for my 31 Model 43 and found this one on eBay. I jumped on it now realizing it isn’t the correct one for me as David kindly posted in the radiator cap thread. So this is definitely a gas cap and not the radiator cap because it is vented, and it is the same 4-1/2” diameter as the radiator cap but with a different lower flange shape. Can anyone confirm which year cap it is???


Also if anyone has a correct 31 gas cap they would be interested in trading please let me know! 

Thanks, Mark





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